Drill jig



Feb. 8, 1944. ATKlNs 2,341,418

DRILL JIG Filed July 2'7, 1942 2 Sheets-Sheet 1 Feb. 8, 1944. n. a. ATKINS 2,341,413

' DRILL JIG Filed July 27. 1942 2 Sheets-Sheet 2 B 2mm Ini/entm' WWI/W Patented Feb. 8, 1944 UNITED STATES PATENT OFFICE 'DRILL JIG Dorothy G. Atkins, Groton, Conn. Application .luly 27, 1942, Serial No. 452,507

6 Claims. (01. 33-189) The present invention relates to new and useful improvements in jigs adapted for use in laylng out and marking. drill holes'in work in exact position with relation :to each other, such as the locating and marking of the centers of holes that are to be drilled in a circle in the work and the invention hasfor its primary object to provide a layout and drill jig embodying a protractor by means of which the holes to be drilled may be accurately marked in their desired relation.

A further object is to provide a device of this character of simple and practical construction, which is eificient and reliable in use, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a plan view.

Figure 2 is an edge elevational view.

Figure 3 is a fragmentary plan view with the guide for the slidable leg of the tool broken away.

Figure 4 is a fragmentary sectional view taken substantially on the line 44 of Figure 3.

Figure 5 is a fragmentary sectional view taken substantially on a line 55 of Figure 1.

Figure 6 is a similar view taken substantially on a line 6-6 of Figure 1.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodimet of the invention, thezl'illmeral 5 designates one leg of the tool having a head 6 at one end thereof substantially in the form of a T-square, the leg being substantially rectangular in cross section and the head Bjhaving one edge indicated at 1 curved in af semicircle and formed on its upper surface with a raised flange 8 with graduations 9 marked'thereon representing 180 degrees of a circle.

A second leg is designated at In likewise of rectangular shape in cross section and is slidably mounted between a pair of segmental plates I I and I2 secured together by screws I3. 7

The head 6 is formed with an opening I3 and the plate II is formed with a stud I4 rotatably mounted in the opening and secured therein by a nut I5 threaded on the stud and bearing against the rear face of the head 5 as shown to advantage in Figure 4 of the drawings. The end of the stud is pointed as shown at I6 which may be used as a center punch for centering the tool in the center of the circle of holes to be marked in the work. One edge of the plate I! is also curved as shown at I! conforming to the inner edge of the flange 8.

The plate I2 is formed with a flared opening I8 constituting a window opening behind which the leg IE] is slidable and the wall of the opening I8 is formed with a mark I9 extending in the plane of the straight edge of the plates H and I2, as well as with the straight edge of the head 6, when the face and head are aligned and the mark I9 is adapted to register with the graduations 20 formed on the upper surface of the leg Ill. The leg I0 is secured in a slidably adjusted position between the plates I I and I2 by a set screw ZI carried by the plate I2.

A pointed marker 22 is formed with a hollow externally threaded shank 23 having a slot 24 therein for slidably receiving the leg 5, the marker being held in adjusted position on the leg by means of a nut 25 threaded on the shank.

The outer end of the leg I0 is formed with an opening 26 in which a marking punch 21 is positioned having a head 28 thereon, the punch being held in the opening by a set screw 29.

The curved side edge of the plate I2 is also provided with a mark 30 in line with the graduations in the flange 8.

With the parts secured in assembled relation as shown it will be apparent that the leg I0 extends transversely of the graduations 9 of the flange 8 so that one edge of the leg aligns with said graduations during the swinging movement of the leg with respect to the head 6.

It is believed the details of construction, manner of use and advantages of the device will be readily understood from the foregoing without further detailed explanation.

Having described the invention, what claimed as new is:

1. A drill jig comprising a leg member having a flat head integrally formed at one end, said head having an opening and provided with graduations concentric with the opening, a fiat guide pivotally mounted in the opening and adapted to lie fiat against the head, a second leg slidably mounted in the guide and intersecting the axis of the opening, means for securing the second leg and the guide in adjusted angular position relative to the first leg, and punches carried by each leg.

2. A drill jig comprising a leg member having a flat head integrally formed at one end, said head having an opening and provided with grad uations concentric with the opening, a flat guide pivotally mounted in the opening and adapted to lie fiat against the head, a second leg slidably mounted in the guide and intersecting the axis of the opening, a prong on the guide adapted to engage the work to form a pivot for the legs, means for securing the second leg and the guide in adjusted position relative to the first leg, and punches carried by each leg.

3. A drill jig comprising a leg member having a flat head integrally formed at one end, said head having an opening and provided with graduations concentric with the opening, a secondv head member having a stud pivoted in said opening and pointed at its end, a second leg slidably mounted in said second head member transversely of the axis of the stud, said second leg also having graduations, a window opening in a the second head member behind which the lastnamed graduations are exposed, a fixed mark on the second head'member adapted to register with the graduations of the first head, a fixed mark on the second head adjacent the window opening for cooperation with the graduations on the second leg, means for securing the second leg in adjusted position and punches carried by each leg.

4. A drill jig comprising a T-shaped member including a leg and a head, said head having a curved edge, a flange on one surface of the head conforming to the curved edge and having graduations, a second T-shaped member including a head and a leg slidably mounted therein and having a working engagement with the graduations on the flange, means pivotally connecting the heads with the second leg intersecting the axis of the pivot means, and a punch carried by each leg.

5. A drill jig comprising a T-shaped member including a leg and a head, said head having a curved edge, a flange on one surface of the head conforming to the curved edge and having graduations, a second T-shaped member including a head and a leg slidably mounted therein and having a' working engagement with the graduations on the flange, means pivotally connecting the heads with the second leg intersecting the axis of the pivot means, said second-named head having a sight opening and said second-named leg having graduations exposed in said opening,

means securing the heads in adjusted position, means securing the second leg in adjusted position, and a punch carried by each leg.

6. A drill jig comprising a T-shaped member including a leg and a head,. said head having a curved edge, a flange on one surface of the head conforming to the curved edge and having graduations, a second T-shaped member including a head and a leg slidably mounted therein and having a working engagement with the graduations on the flange, a stud pivotally connecting the heads, said second leg intersecting the axis of the stud, a nut threaded on the stud securing the heads in adjusted position, means securing the second leg in adjusted position in the second.

head, and a punch carried byeach leg.

DOROTHY G. ATKINSi 

